Or – “Comic-Book Time: Explained.” The Marvel Universe as we know it (barring a few retcons and absorptions of existing properties such as Captain America) can be seen to have begun with the first issue of the Fantastic Four.  For the first few years, it seemed that the stories were happening in ‘real time,’ but slowly, time in the Marvel Universe began to change, to stretch and flow and even reverse itself a time or two.  Many a comics fan has remarked at one time or another how difficult it is to resolve the sheer number of happenings with the…